package com.linkai.注解和反射.reflect;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

/**
 * @Description: 分析性能问题
 * @Author: 林凯
 * @Date: 2021/10/21 19:42
 */
public class Test10 {
    // 普通方式调用
    public static void test01() {
        User user = new User();
        long startTime = System.currentTimeMillis();
        for (int i = 0; i < 10000000; i++) {
            user.getName();
        }
        long endTime = System.currentTimeMillis();
        System.out.println("test01: " + (endTime - startTime));
    }

    // 反射方式调用
    public static void test02() throws NoSuchMethodException, InvocationTargetException, IllegalAccessException {
        User user = new User();
        Class<? extends User> c1 = user.getClass();
        Method getName = c1.getDeclaredMethod("getName", null);
        long startTime = System.currentTimeMillis();
        for (int i = 0; i < 10000000; i++) {
            getName.invoke(user, null);
        }
        long endTime = System.currentTimeMillis();
        System.out.println("test02: " + (endTime - startTime));

    }

    // 反射方式调用 关闭检测
    public static void test03() throws NoSuchMethodException, InvocationTargetException, IllegalAccessException {
        User user = new User();
        Class<? extends User> c1 = user.getClass();
        Method getName = c1.getDeclaredMethod("getName", null);
        getName.setAccessible(true);    // 关闭检测
        long startTime = System.currentTimeMillis();
        for (int i = 0; i < 10000000; i++) {
            getName.invoke(user, null);
        }
        long endTime = System.currentTimeMillis();
        System.out.println("test03: " + (endTime - startTime));
    }

    public static void main(String[] args) throws NoSuchMethodException, IllegalAccessException, InvocationTargetException {
        test01();
        test02();
        test03();
    }
}
